diff --git a/core/huya/dfp_register.py b/core/huya/dfp_register.py
index 53fc233..003bc4b 100644
--- a/core/huya/dfp_register.py
+++ b/core/huya/dfp_register.py
@@ -87,6 +87,7 @@ def _build_select_operator_request(
 ) -> bytes:
     """按 selectOperator 的四段结构动态编码请求。"""
     dev = {
+        # 仅供无画像的协议级独立调用兜底；生产登录始终传入账号画像。
         "app_version": "13.4.22",
         "model": "M2102J2SC",
         "fingerprint": fingerprint or "02df398797432eadefcc12767119ad5e80999389",
diff --git a/tests/test_huya_dfp_register.py b/tests/test_huya_dfp_register.py
index fdf1caa..6eae736 100644
--- a/tests/test_huya_dfp_register.py
+++ b/tests/test_huya_dfp_register.py
@@ -87,9 +87,7 @@ class TestRandomDfpBody:
                 "core.huya.dfp_register._random_triple",
                 return_value=("h" * 64, "r" * 64, "k" * 64),
             ),
-            patch(
-                "core.huya.dfp_register.os.urandom", side_effect=lambda n: b"\0" * n
-            ),
+            patch("core.huya.dfp_register.os.urandom", side_effect=lambda n: b"\0" * n),
         ):
             body = _build_random_dfp_body(profile)
         assert hashlib.sha256(plaintext).digest() in body[-CW_LEN + 2 :]